How do I get my Chinese wife to come to Canada? http://www.cic.gc.ca/english/immigrate/sponsor/spouse.asp, you can use the same website to help her get a visitor visa, but she will need to show that she will return to China at the end of the visa validity.
will she be automatically granted sponsorship and Visa? No, its not automatic, but if the relationship is genuine and you show you plan to return to Canada it is very likely
How long is the process? If you read the first link, there are two options. I am going through sponsoring my chinese wife right now too. We have chosen to do the outland process. Every situation is different, as you said she is still in China, unless you can get her into Canada you will need to do the outland one as well. Which is estimated 9 months, feedback I have seen indicates its about a year if you have a complete application.
Is my child going to be a Canadian citizen? Yes
How do I bring my child and wife to Canada? See Question 1
What's the best solution for us? There is a variety of factors, if you can get her a visitor visa to Canada ASAP you could get her here, fill out the inland application and continue to extend her visitor visa until it is complete, however, also consider her access to healthcare in Canada throughout the pregnancy. Which province are you intending to live in? Some offer health care for spouse on day 1 of arrival, some don't
I think if you can give the group a little more information on your and your wife's situation it would help to give proper advice.
Good luck. PM me if you would like to ask questions specific to China.